Strain-insulator.



No. 861,094. PATENTED JULY 23. 1907. H. P. DAVIS. STRAIN INSULATOR. PPLIOATION FILED JUNE 4, 190e.

WITNESSES:

ATTORNEY 30 may be attached io iSs opposite otemiy; A mami head 3 a ocad substantially in 'dief NTED ST' Application lerl June 4,1966. Serial iin. 3201135:

To (all whom 'it may concern:

lated from auch @thor ae dirumly :slfpni'atod by insulat- Bo it known that l, HARRY DAVIS, a ciizen of tho l ing tubes that are @pablo of iosisting high voltage United States, mid a resident o Pittsburg, in the county sii'aius. @i Allegheny and Stats of 'onnsy'h'miia. liawinvented o a new and useful Impiovemen in Smin-zxsuimo which the-following il specification.

My invention reluvs to atm-in insulafizmsior ole.

he @mi of the tubo 5, opposite the cap G, is providsil with Cap l and a phangfr .ll having :l projection i3 (il) wncii f um is omtsmirdiy lifough :i holo in the ap und Civic upon which 5C in loop 13, ,finos aai-Ll iL has [o itil object lo pmt/ide a device of fiif my l; pmvidg' a. img'v 14 mid, as Lim Lube 2 is Said @ass tlm-1, shi-il be .mpio and compi u in com' uhm-ber than the Linn und simil hf: :M Wcfed foi' use 'v v voltage oleoia'io lines.

lo die consuuction of electric lines am such lirios as 'e adopte-i for railway roi.

Tod l, :moulded iumlalorlproforsrln :Surrounds lio rod l irowem; Llo flange M and *lie lu-:iin loop #i in @der to seal tho mbo- 2. Willi the insuimor e described, l have fouid flint ilio liest i1'- 'ooimil y Bfivg, ii- S Suits may be obtained by rst assomblingzxll tho parts *"tonowcessmy to uiilize means 'lor inochanfally conexcept, the molded insulator 15, the cap l0, l,

he plungor ll amd, tliaswin loop l, lien pouring a hotiiquid imm 7i? compound. imo tho optico above Llio head 3. this is done mild th. Whole tube stncliuv 'is vos@ when one i5 eloctrcaliy connectf 'i'. This pressure is rvadzipto for thi? Sov above indicated.

Romri-ng io *bho omwing, rod 0i* mbe l o @uit-able gub@ Iii-Jorim is'povided with a Sleeve 52, composed o com; gall-v he insulator' 15, which may b@ formed o I 25 pfesaod micapapoi and. varnish of oie 5 *it-ble nSU.- v one several Well. lmown Compositions, will profv- 8# loting composition which is adequate 15o resist occasioned 'oy rela-tively high voltages. head or ailiax'gemont?) muy be screwthreadod or liei'wise formed il o liquid compound Within the tube 5 becomes culi. or asifeuod upon one and o1' the o and #5min loop 4" aan solid, Compact mass results which yields only "L vs'il n loop l md that zin cap l5 may ige replaced by any conveniout alf Y, of e-'hoi'i a line comincio? may be nu ends the azsiemoiod insulator :un im El six/:e and ai* migomant of dans n: este@ 'la'thii'i scopo 0*" my lrivan'tion.

my invention:

'tubo 5 is `provided with a, cap 6 at, opening 7, loatmzialy consenti'. through which the insulated rod l ivoly short who 85 of vofy hard in like or similar te than of which Lim i.

incluida 'the ered and is im like head 3 Pfl the cap (iL The fnim. i ubs 8 is such that he outer suface nl' im haw;

usb Wih that of the tube, and i'lfsioim is suc-n iiilde oi i miie 5 4 he 3 is iisulatod Sw one @mi haw er m ng a metal tubo, L rod thm 1s an enlargement located suhle 1.1i the Luba, insutng tubes i* mi tub-c and insulating tubi:

bib

vomi mba maximo? comp'si K a rofl havliif; nu c me end, a metz-.l tube having ofachublo ij :l une (y nl aubsl'alumilyae Same mmclalmd ,.n- Sunmmd-mg the ma mmrgemnt ma exten a'oiis :is ne mbe S. The space within lle nube wie men tube from end to und inaulmA @woon the collair 3 and its oyen end, may so if; m ewig of the enlurgemeu und the 1 any su milo insulating materia-l 8, which is ez ilud 1,q5-m 1. l 12 Wlipiiimeni. lumi oocomesfsolid bald flusso-lol. one a mem] mbe Dwing nu mumung lining The @Rangement oi parte 1s yspecially weil adap-u which head may be forced, a cup on one emi 0l l Y. for withstanding mechanical strains, thv mbe 5 and um@ who a Sleeve urfowdns the mi, and iwi '1L' :ing imeriri interposed beweezi the heal o the fori 'l being under tension, While the who 8 i5 node2" m man u: my.

55 potontial, gineV ik@ conducting parte Whchare lnsuand, a mm1 su'begmsmgly in tenslon, having a non m surrounds the sleeve-between the strain loop and the cap,

end of the metal tube.

l threaded into the cap and. having a strain loop a'ttach'ed terially larger than the diameter of -the enlargement, end caps one of which is fitted over the insulating sleeve, an insulating tube, normally in compression, which is located Vbetween said end cap and the rod enlargement, and means for completely,insulating the rod and collar from the metal tube and its cud cap.

5. A strain insulator largement and the-tube having the same external diameter and extending material distances therefrom in both directions, a metal tube fitted over the insulating tubes, a metal cap screw-threadedupon one end of the metal tube against the corresponding ends of the insulating tubes, a cylindrical insulating block fitted into the outer insulating tube, anda strain cap screw-threaded upon the corresponding 6. A strain insulator comprising a rod having a head at one end and a strain loop at the other end, a sleeve of insulating material surrounding the 'rod between thel head andthe loop, a metal tube into which said rod projects, said tube having caps screwed upon its ends, one of which has a strain loop, aud insulating material completely illing the space between the rod and tliewallsof the tube.

7.. A strain insulator comprising` a rod having a head at one end and a strain loop at the sulating material between the head and the loop, a cap fitted over the sleeve, a metal tube having one end screwto its oppositei'end,v atube of hard insulating material between the head and the cap,

and insulating material filling the remaining space within l the metal tube.

` 8. A strain insulator comprising a rod having a head at one end and a strain loop aty the other end, a tube or between tbe head and the cap, a, plunger fitted into the free end of the metal tube and having a screw-threaded projection, a second cap screw-threaded onto the metal tube and having a hole through which the plunger proj ection extends, a strain loop attached to the plunger projection, and insulating material that iills the remaining space in the metal tube.

9. A strain insulatorcomprising' a rod having a head at one end and a strain loop at the other end, a sleeve of iusulatingr material between the head and the loop, a cap fitted over the sleeve, a metal tube screw-threaded into the cap, a tube of hard insulating material within the metal tube between the head and the cap, a plunger fitted into the free end of the metal tube and having a screwthreaded a second cap screw-threaded upon the metal tube and having a hole through which the plunger projection extends, a strain loop attached to the plunger prujection, a molded insulator which seals said sleeve and extends from the strain loop'to the cap, and insulating material that fills tl e remaining space within the metal tube.

, 10. A strain-insulator comprising a metal removable end caps, a rod located partially without said tube and having a head upon its tube having extending from its head nearly to itsl outer end, and solid insulating material filling the remaining space within the Ymetal tube,

into which the enlargement is fitted. l

In testimony whereof, P`have hereunto' subscribed my name this 26th day of May, 1906.

. HARRY P. DAVIS.

Witnesses 1 CAROLINE E. S. MYERS, BmNnY HINns. 

